20845448177 has 4 divisors (see below), whose sum is σ = 20873656560. Its totient is φ = 20817239796.

The previous prime is 20845448147. The next prime is 20845448189. The reversal of 20845448177 is 77184454802.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20845448177 - 2¹⁰ = 20845447153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20845448147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14103083 + ... + 14104560.

It is an arithmetic number, because the mean of its divisors is an integer number (5218414140).

Almost surely, 2^20845448177 is an apocalyptic number.

It is an amenable number.

20845448177 is a deficient number, since it is larger than the sum of its proper divisors (28208383).

20845448177 is an equidigital number, since it uses as much as digits as its factorization.

20845448177 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28208382.

The product of its (nonzero) digits is 2007040, while the sum is 50.

The spelling of 20845448177 in words is "twenty billion, eight hundred forty-five million, four hundred forty-eight thousand, one hundred seventy-seven".